Estimation of liquefaction potential in Eco-Delta City (Busan) using different approaches with effect of fines content
- PDF / 5,965,905 Bytes
- 30 Pages / 595.276 x 790.866 pts Page_size
- 92 Downloads / 196 Views
ORIGINAL RESEARCH
Open Access
Estimation of liquefaction potential in Eco‑Delta City (Busan) using different approaches with effect of fines content Bahareh Bahari1, Woongki Hwang1, Tae‑Hyung Kim1* and Young‑Suk Song2 *Correspondence: [email protected] 1 Department of Civil and Environmental Engineering, Korea Maritime and Ocean University, 727 Taejong‑ro, Youngdo‑Gu, Busan 49112, Republic of Korea Full list of author information is available at the end of the article
Abstract Soil liquefaction which is a disastrous phenomenon induced by the earthquake, is widely investigated in many researches in geotechnical engineering. In this study, a SPT-N based investigation is carried out to assess the susceptibility of liquefaction in Eco-Delta city, located in the southwestern part of Busan city in South Korea. Data from 229 sites are analyzed for the earthquake of 7.5 magnitude with a peak horizontal acceleration of 0.2 g to carry out the liquefaction potential index (LPI) through two deterministic methods which have different factors of safety (FS). The liquefaction probability is investigated by the deterministic and reliability methods and the lique‑ faction hazard maps are generated. To observe the effect of fines content and plasticity index on the liquefaction susceptibility, three different cases are considered. It is found that among the four approaches used, Overseas Coastal Area Development Institute of Japan (OCDI) method showed more sensitivity to changes of fines content and plastic‑ ity index. The Eco-Delta city is found to be highly vulnerable to liquefaction having 91% of sites with LPI values greater than 15. Keywords: Liquefaction, Fines content, Liquefaction potential index, Liquefaction hazard map, Standard penetration test, Busan city
Introduction Soil liquefaction refers to a phenomenon wherein a saturated soil loses strength in response to a dynamic load, usually earthquake shaking causing to increase in pore water pressure. Increase in pore water pressures is the result of rapid loading situation during seismic events where there is not enough time for dissipation of excess pore water pressures through natural drainage. The increased pore water pressure transforms granular materials from a solid to a liquefied state. Soil liquefaction mostly occurs for saturated loose sand [1]. Such a ground failures have been widely occurred during numerous devastating earthquakes and therefore, it has become an attractive research topic in geotechnical engineering. The soil liquefaction mostly depends on the magnitude of earthquake, ground motion, site specific conditions, ground acceleration, type and thickness of the soil deposit, relative density, grain size distribution, fines content,
© The Author(s) 2020. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Co
Data Loading...
